Good point about capacity - there can be overkill there, as well as in the weight of the pack itself. I always liked Granite Gear packs, but eventually drifted away from them because they were just too big, even with the extension sleeve rolled all the way down. One of the things I like about my current pack is that it's 50 liters unextended, but has a nice extension cuff. I always found that too much capacity led to a "floppy" pack.